Condensation of 2,2?dithiodibenzoyl chloride (I) with sulfacetamide (II) in pyridine afforded diamide (III). Reductive celavage of the disulfide bond of (III) by means of tris(2-carboxyethyl)phosphine produced the corresponding thiol (IV), which was subsequently acylated with 5-bromovaleryl chloride (V) yielding thioester (VI). Finally, displacement of the bromide with pyridine furnished the title pyridinium salt.